Seismicity of Mount Hood and structure as determined from teleseismic P wave delay studies

Journal Article · Sat Apr 10 04:00:00 EST 1982 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JB087iB04p02782· OSTI ID:6807485

Weaver, C S; Green, S M; Iyer, H M

A 16-station seismic network was established in the Mount Hood area of Oregon in 1977 as part of a multidisciplinary study to evaluate the geothermal potential of a typical Cascade volcano. The immediate objective was to monitor local seismicity and to study the P wave velocity structure of the crust and upper mantle. During the 13 months the network was in operation, 10 local earthquakes were recorded. All these events are spatially associated with the volcano and occurred at shallow depths roughly defining a zone striking north-northwest. The largest earthquake, a magnitude 3.4 event, was preceded by a single foreshock and followed by three locatable aftershocks. These and the five other located earthquakes were of magnitude less than 2.0. Fifty-five teleseisms were recorded by the network and used in a teleseismic P wave delay study. The residuals from the P delay study indicate that there is no significant velocity anomaly associated with the Mount Hood volcano and only small velocity variations in the Mount Hood region.

• Research Organization: U.S. Geological Survey, Menlo Park, California 94025
• OSTI ID: 6807485
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 87:B4; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
580202* -- Geophysics-- Volcanology-- (1980-1989)
CONTINENTAL CRUST
EARTH CRUST
EARTH MANTLE
EARTHQUAKE MAGNITUDE
FEDERAL REGION X
NORTH AMERICA
OREGON
SEISMIC P WAVES
SEISMIC WAVES
SEISMICITY
USA
VOLCANIC REGIONS
VOLCANOES
WAVE PROPAGATION